#39769 chore: Apply strategy pattern to abac

Proposed changes (including videos or screenshots)

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Steps to test or reproduce

Further comments

This is a setup for the ABAC 2 PoC. We need the pdp (decision point) to be interchangeable. Public service API doesn't change, just a few adjustements on the internals of the package to allow for switching.

The switch will be done with a setting, once the External PDP works.

Summary by CodeRabbit

• Refactor
  • Refactored attribute-based access control architecture to support pluggable evaluation strategies (local and external).
  • Enhanced decision caching mechanism to improve access control performance.

CORE-1988